Here is a list of life expectancies in 12 South American countries:
62,64,65,66,70,71,72,73,73,74,75,75
The mean of these data is 70, and the SD is 4.6. (You do not need to verify this.) Without doing any calculations, which data point had the largest contribution to the SD? That is, if we could remove one of the data points, which data point should we remove if our goal is to make the SD of the remaining 11 points as small as possible? Why?